/* 基础设置 */
body,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
p,
blockquote,
dl,
dt,
dd,
ul,
ol,
li,
pre,
form,
fieldset,
legend,
button,
input,
textarea,
th,
td {
    margin: 0;
    padding: 0;
}

ul,
ol {
    list-style: none;
}

img {
    /* 底部留白 */
    display: block;
    border: 0;
}

b,
strong {
    font-weight: 400;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    /* 父元素字号的百分比 */
    font-size: 100%;
}

i,
em {
    /* 不倾斜 */
    font-style: normal;
}

u,
ins,
s,
del {
    /* 去掉中划线和下划线 */
    text-decoration: none;
}